It could be poor circulation,check with your medical person for some answers....the best to you
My Legs Hurt When I Sit Down?
Maybe you have sore joints, get some rest and see if they improve.-Trey
I'd love an answer to this - this happens to me as well. I walk a lot, and I am very active, but when I sit for longer than 10 minutes, it hurts badly to move. I try very hard not to sit down but... My job is sedentary. I've been hit by a car twice in 20 years and also broke my tailbone rollerblading. Doesn't hurt when I walk, dance, run or otherwise using my legs. I also have poor circulation, which is why I remain so active (varicose veins due to a genetic defect in the valves). I would definitely ask orthopedist, cardiovascular and chiropractor their thoughts.
